tompkins



I. & A. G. TOMPKINS.

MACHINE FOR GRINDING SHAVINGS. 1 139,399, Patented April 10, 1877 LEQIQH IL N. PETERS, FHDTO-LITHOGRAPHER. WASHINGTON. D C

PATENT .FFICE.

IMPROVEMENT lN MACHINES FOR G'RINDING SHAVINGS.

Specification forming part of Letters Patent No. 189,399, dated April10, 1877; application filed October 23, 1876.

To all whom at may concern:

Be it known that we, ISAAC TOMPKINS and ABRAM G. TOMPKINS, of Brooklyn,in the county of Kings and State of New York, have invented a new andImproved Machine for Grinding up Shavings, of which the following is aspecification:

In the accompanying drawing, Figure 1 represents a top view, and Fig. 2a vertical transverse section on line :10 as, Fig. 1, of our improvedmachine for grinding up shavings; and Figs. 3 and 4: are, respectively,a detail front view and a section on line y y, Fig. 4, of the inclosingcylinder or shell.

Similar letters of reference indicate corresponding parts.

The object of this invention is to provide an improved machine by whichthe large quantity of shavings accumulating in door and sash factories,planing-mills, 860., may be utilized by grinding them up into smallparticles in the size of sawdust, so as to form thereby a more salablearticle.

The invention consists of an interior grinding-cylinder that revolveswithin an inclosing-cylinder, having a cutting-surface and exitperforations, the inclosing-cylinder forniing a space around the innercylinder that diminishes gradually in. width.

The small pieces into which the shavings are cut pass through theperforations of the outer cutting-cylinder to an exterior casing, fromwhich they are conducted to a suitable receptacle.

In the drawing, A represents the interior grinding-cylinder, that isrevolved at suitable speed, and constructed of circumferential sectionsB, with diflerently-shaped grinding orcutting teeth or projections a, asshown in Figs. 1 and 2.

The sections B may be provided with any suitable number and shape ofteeth, by which a reliable and speedy cutting, grinding, or

rasping action is imparted on the shavings, that are fed through a tophopper, O, extending across the entire width of the cylinder.

The interior revolving cylinder A is inclosed by a fixed cylinder orshell, D, which is provided with sectional cutting-surfaces at the innerside. The space between the inner cylinder and outer shell diminishesgradually from the entrance point at one side of the hopper to theopposite side of the same, so that a considerable quantity of shavingsmay be fed to the action of the grinding-surfaces, and cut up into smallpieces by the gradual approach of the same, without getting choked intheir passage through the space between the cylinder and shell.

The outer cylinder or shell D is, in similar manner as the revolvingcylinder, made of a number of sections, which are arranged with rows oflongitudinal cutting-teeth 1), alternating with rows of lateralchipping-teeth d. Intermediately between the teeth are perforations e,which correspond in size to the pieces. to which the shavings are to bereduced. If the shavings are to be ground into small pieces the size ofthe perforations has to be made correspondingly small. If larger piecesare desired the holes of the outer sections have to be made larger.

The shell acts thus in the nature of a screen, besides the cutting andchipping action exerted by-its projecting teeth. The groundup piecespass gradually through the shell, and are conducted by an outerinclosing-casing, E, with bottom spout, to a suitable receptacle belowthe machine.

The pieces of shavings that are not ground up sufliciently to escapethrough the holes 0 are passed back again with the inner cylinder to thehopper, and fed with the new shavings again to the grinding-surfaces.The revolving cylinder may also be made of concave or convex shape,according as it is desired to throw the shavings towardthe center or theends, the inclosing-shell being then made to correspond in shape to thesame.

The accumulating shavings of wood-working establishments may thus beworked with great rapidity into small pieces, in the nature of sawdust,so as to be sold like the same at a better price, and be stored away ina more compact shape.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent- 1. The combination, in a shaving-grinder, ofthe case E, fixed grinding-cylinder D, and rotary grinding-cylinder A B,substantially as and for the purpose specified.

2. In a shaving-grinder, the shell provided with alternate longitudinalcutters and chip ping-teeth b d, between which are arranged perforationse, as shown and described.

ISAAC TOMPKINS. ABRAM G. TOMPKIN S. Witnesses:

O. Snnewrox, ALEX. F. RoBER'rs.

